<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        li {
            list-style: none;
        }

        .w {
            width: 1226px;
            margin: 0 auto;
        }

        .header {
            height: 150px;
            background: grey;
        }

        .wrapNav {
            height: 45px;
        }

        .navBar {
            background-color: #ff0;
            width: 100%;
        }

        .nav {
            display: flex;
            height: 45px;
            line-height: 45px;
        }

        .nav li {
            flex: 1;
            border: 1px solid #000;
            text-align: center;
        }

        .nav li+li {
            border-left: 0;
        }

        .main .part {
            height: 400px;
            text-align: center;
            line-height: 400px;
            border: 1px solid #000;
        }

        .main .part+.part {
            border-top: 0;
        }

        .tips {
            width: 100%;
            line-height: 45px;
            position: fixed;
            bottom: 0;
            background-color: rgba(0, 0, 0, 0.5);
            text-align: center;
            display: none;
        }

        .back {
            width: 45px;
            height: 45px;
            border: 1px solid #333;
            text-align: center;
            line-height: 45px;
            position: fixed;
            right: 5px;
            bottom: 50px;
            display: none;
        }
    </style>
</head>

<body>
    <div class="header w"></div>
    <div class="wrapNav">
        <div class="navBar">
            <ul class="nav w">
                <li>link_01</li>
                <li>link_02</li>
                <li>link_03</li>
                <li>link_04</li>
                <li>link_05</li>
                <li>link_06</li>
            </ul>
        </div>
    </div>
    <div class="main w">
        <div class="part">part_01</div>
        <div class="part">part_02</div>
        <div class="part">part_03</div>
        <div class="part">part_04</div>
        <div class="part">part_05</div>
        <div class="part">part_06</div>
        <div class="part">part_07</div>
        <div class="part">part_08</div>
        <div class="part">part_09</div>
        <div class="part">part_10</div>
    </div>
    <div class="tips">到达底部</div>
    <div class="back">top</div>
</body>


</html>